Electric heater for fans



Sept 15, 3925. 1,553,412

J. C. WOODSCN ELECTRIC HEATERJFOR FANS Filed Jan. 8, 1923 WfiNESSES:lNVENTOR C M Jamca ($.Woodson.

ATTORNEY Patent ed Sept. 15, 1925.

UNITED STATES.

rArsNr orrics JAMES C. WOODSON, OF EAST PITTSBURGH, PENNSYLVANIA,ASSIGNOR T0 WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, ACORPORATION OF PENNSYL- VANIA.

ELECTRIC HEATER FOR FANS.

Application filed January 8, 1923. ,Serial No. 611,231.

To all whom it may concern:

Be it known that I, J AMES C. WOODSON, a citizen of the United States,and aresident of East Pittsburgh, in the county of Allegheny and Stateof Pennsylvania, have invented a new and useful Improvement in ElectricHeaters for Fans, of which the following is a specification.

My invention relates to electrically heated devices and particularly toelectrically heated blower fans. 1

The object of my invention isto provide a relatively simple, compact,inexpensive and easily installed heating unit for a portable blower fan.

In practicing my invention, I provide a tubular refractoryresistor-supporting member on and in which a resistor member is Wound.The refractory supporting member is located in the nozzle of a blowerfan and is secured to the closure member of the nozzle by a plurality ofmachine screws located invlongitudinally extending lugs integral withthe refractory member. The closure member is provided with an integraldepending flange to which a suitable terminal device is secured.

In the single sheet of drawings,

Figure 1 is a View, in side elevation, of a blower fan comprising thedevice embodying my invention, certain parts being cut away to show theinterior construction thereof,

Fig. 2 is a view, in side elevation, of a refractory resistor-supportingmember and a resistor located thereon, and

Fig. 3 is a view, in end elevation, of the refractoryresistor-supporting member illustrated in Fig. 2.

A blower fan casing 11, of substantially volute form, has mountedtherein a blower of the usual type, that is driven by a small electricmotor which may be located either .within or without the casing 11. Asthese parts are of standard construction and constitute no part of myinvention, it is not believed necessary or desirable to furtherillustrate and describe the same.

The casing 11 is provided with a tangentially extending nozzle portion'12 which may be provided with an outwardly flared end 13. 7

Within the nozzle 12 and extending longitudinally thereof and co-axiallytherewith,

is located a refractory resistor-supporting member 14 of substantiallytubular shape.

The refractory electric-insulating member 14 is provided with aplurality-of symmetrically spaced grooves or slots 15 located in theedges of the tubular portion and with a pair of integral andlongitudinally extending lugs 16 located on the outside of the tubularportion of the member 14 and in diametrally opposed position. Each ofthe lugs 16 is providedwith an opening 17 extending therethrough. Ahelicallv coiled resistor member 18 is wound on the inside and on theoutside of the member 14, the ends of the resistor member being broughtout through openings 19 extending radially through one wall of thetubular member 14.

The heating element, comprising the members 14 and 18, is held in itsproper operative position against a perforated closure, member 21 bymeans of machine bolts 22 which extend through the openings 17, a nut 23being provided on each of the bolts 22 to provide a spacing memberbetween the inner surface of the closure member 21 and the adiacent endof the refractory member 14.

The closure member 21 is provided with a depending integral flangeportion 24 against the inner surface of which is mounted a suitableterminal member 25 which extends through one wall of the nozzle 12 atthe lower portion thereof, a suitable opening 26 being provided topermit of this. The ends of the resistor member 18 extend into theterminal device 25 at the upper end thereof and the ends of a suitablesupply-.

circuit conductor 27 extend into the terminal device at the lower endthereof, suitable means, not shown, being provided in the terminaldevice for electrically connecting the ends of the supply-circuitconductors and the ends of the resistor member. A helical spring 28 hasone end thereof extending into the terminal device 25 and surrounds thesupply-circuit conductor 27 over a portion of its length to preventundue kinking or bending thereof. The terminal device 25 is securedagainst the flange portion 24 by a machine screw 29, a nut 31 beingprovided thereon adjacent the rear surface of the device 25.

The heating element, comprising the refractory supporting member 14 andthe resistor member 18 wound thereon, may be easily and quickly securedin its proper operative position against the inner surface of theclosure member 31, and the terminal device 25 may also be located andheld in its proper operative position while the closure member isdisassociated from the casing 11. When the closure member is placedin-its proper operative position against the outer end of the nozzle 12and secured thereagainst by any suitable means, (not shown), the

heating element is located in its proper operative position within thenozzle 12 and is adapted to heat the air forced therethrough portedthereby.

and out of the perforated closure member 21. In case of necessity ofrepair of the heating element, it may be easily andquickly' cations areintended to be covered bythe apcover member, and a resistor located onboth surfaces of the tubular member and sup- 2. In a motor-drivenblower, in combination, a blower casing having an open end portion ofsubstantlally tubular form, a perforated cover member secured againstthe outer end of said open end portion, and a double-layer heatingelement in said open end portion and secured against the inner surfaceof said cover member.-

3. In a motor-driven blower, the combination with an open-end blowercasing, of a perforated cover for said open end, a tubular refractorymember secured to said cover member, and having a pluality of spacednotches in each of the end surfaces, and a resistor member extendingalong the inner and the outer surfaces of said refractory member andmaintained in proper operative position relatively thereto by saidnotches.

4. In a motor-driven blower, in combina tion, an open-end blower casing,a perforated cover for said open end, a heating element in said casingadjacent said open end 'and supported by said cover, and a terminalblock supported by said cover member.

5. In a motor-driven blower, in combination, an open-end blower casing,a perforated cover for said open end having a depending integralextension, a heating element in said casing adjacent said open end,secured to and supported by said cover, and a terminal block projectinginto said casing, secured to and supported by said depending integralextension.

6." In a motor driven blower, in combination, an open-end blower casing,a removable cover for said open end havinga depending integralextension, a heating element in said casing and a terminal block beneathsaid casing, said heating element and said terminal block beingsupported by said cover and said integral extension re-' spectively andbeing removable from said b ower with said cover.

In testimony whereof, I have hereunto subscribed my name this second dayof January, 1923.

JAMES C. WOQDSON.

